一叶萩大孢子发生和雌配子体发育

Megasporogenesis and Development of Megagametophyte of Flueggea suffruticosa( Pall. ) Baill.

采用石蜡切片法对一叶萩(Flueggea suffruticosa(Pall.)Baill.)雌花大孢子发生及雌配子体的发育过程进行了观察。结果表明:一叶萩子房上位,中轴胎座,三室,每室2枚倒生胚珠,双珠被,厚珠心,具大戟科常见的珠心喙和珠孔塞。胚囊发育为蓼型,成熟胚囊结构为:卵器位于珠孔端,包括2个助细胞和1个卵细胞;中央是1个二核的中央细胞;合点端为3个反足细胞。本研究为大戟科植物生殖生物学和传粉生物学研究提供了基础资料,同时对大戟科植物系统分类研究有一定意义。

Megasporogenesis and development of megagametophyte of the pistillate flower in Flueggea suffruticosa were observed by using the method of paraffin sections. The results showed that the pistillate flower of F.suffruticosa had epigynous ovary which was axile placenta; each ovary had 3 locules and bearing 2 anatropous bi-integument ovules in each locules. The ovules were crassinucellate and had nucellar beak and obturator. The development of embryo sac was of the Polygonum type. The mature embryo sac was consisted of two synergids and an egg cell near the micropyle, a central cell with two nucleus in the center, three antipodal cells by the side of chalaza. These results could provide basic data for the research of reproductive biology and pollination biology in Euphorbiaceae, meanwhile, for the research of plant taxonomy in Euphorbiaceae.